Commit d497a82f authored by Damien Zammit's avatar Damien Zammit Committed by Takashi Iwai
Browse files

ALSA: usb-audio: Add mixer control for Digidesign Mbox 1 clock source 



This patch provides the infrastructure for the Digidesign Mbox 1
to have a mixer control for selecting the clock source.
Valid options are Internal and S/PDIF external sync.
A non-documented command is sent to the device to enable this feature
found by reverse engineering and bus snooping.

Signed-off-by: default avatarDamien Zammit <damien@zamaudio.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent ddcecf6b

sound/usb/mixer_maps.c

+9 −0
Original line number Diff line number Diff line
@@ -179,6 +179,11 @@ static struct usbmix_name_map audigy2nx_map[] = { 
	{ 0 } /* terminator */

};



static struct usbmix_name_map mbox1_map[] = {

	{ 1, "Clock" },

	{ 0 } /* terminator */

};



static struct usbmix_selector_map c400_selectors[] = {

	{

		.id = 0x80,
@@ -415,6 +420,10 @@ static struct usbmix_ctl_map usbmix_ctl_maps[] = { 
		.id = USB_ID(0x0ccd, 0x0028),

		.map = aureon_51_2_map,

	},

	{

		.id = USB_ID(0x0dba, 0x1000),

		.map = mbox1_map,

	},

	{

		.id = USB_ID(0x13e5, 0x0001),

		.map = scratch_live_map,

sound/usb/mixer_quirks.c

+129 −0
Original line number Diff line number Diff line
@@ -565,6 +565,131 @@ static int snd_xonar_u1_controls_create(struct usb_mixer_interface *mixer) 
	return 0;

}



/* Digidesign Mbox 1 clock source switch (internal/spdif) */



static int snd_mbox1_switch_get(struct snd_kcontrol *kctl,

				struct snd_ctl_elem_value *ucontrol)

{

	ucontrol->value.enumerated.item[0] = kctl->private_value;

	return 0;

}



static int snd_mbox1_switch_put(struct snd_kcontrol *kctl,

				struct snd_ctl_elem_value *ucontrol)

{

	struct snd_usb_audio *chip;

	struct usb_mixer_interface *mixer;

	int err;

	bool cur_val, new_val;

	unsigned char buff[3];



	cur_val = kctl->private_value;

	new_val = ucontrol->value.enumerated.item[0];



	mixer = snd_kcontrol_chip(kctl);

	if (snd_BUG_ON(!mixer))

		return -EINVAL;



	chip = mixer->chip;

	if (snd_BUG_ON(!chip))

		return -EINVAL;



	if (cur_val == new_val)

		return 0;



	down_read(&chip->shutdown_rwsem);

	if (chip->shutdown) {

		err = -ENODEV;

		goto err;

	}



	/* Prepare for magic command to toggle clock source */

	err = snd_usb_ctl_msg(chip->dev,

				usb_rcvctrlpipe(chip->dev, 0), 0x81,

				USB_DIR_IN |

				USB_TYPE_CLASS |

				USB_RECIP_INTERFACE, 0x00, 0x500, buff, 1);

	if (err < 0)

		goto err;

	err = snd_usb_ctl_msg(chip->dev,

				usb_rcvctrlpipe(chip->dev, 0), 0x81,

				USB_DIR_IN |

				USB_TYPE_CLASS |

				USB_RECIP_ENDPOINT, 0x100, 0x81, buff, 3);

	if (err < 0)

		goto err;



	/* 2 possibilities:	Internal    -> send sample rate

	 *			S/PDIF sync -> send zeroes

	 * NB: Sample rate locked to 48kHz on purpose to

	 *     prevent user from resetting the sample rate

	 *     while S/PDIF sync is enabled and confusing

	 *     this configuration.

	 */

	if (new_val == 0) {

		buff[0] = 0x80;

		buff[1] = 0xbb;

		buff[2] = 0x00;

	} else {

		buff[0] = buff[1] = buff[2] = 0x00;

	}



	/* Send the magic command to toggle the clock source */

	err = snd_usb_ctl_msg(chip->dev,

				usb_sndctrlpipe(chip->dev, 0), 0x1,

				USB_TYPE_CLASS |

				USB_RECIP_ENDPOINT, 0x100, 0x81, buff, 3);

	if (err < 0)

		goto err;

	err = snd_usb_ctl_msg(chip->dev,

				usb_rcvctrlpipe(chip->dev, 0), 0x81,

				USB_DIR_IN |

				USB_TYPE_CLASS |

				USB_RECIP_ENDPOINT, 0x100, 0x81, buff, 3);

	if (err < 0)

		goto err;

	err = snd_usb_ctl_msg(chip->dev,

				usb_rcvctrlpipe(chip->dev, 0), 0x81,

				USB_DIR_IN |

				USB_TYPE_CLASS |

				USB_RECIP_ENDPOINT, 0x100, 0x2, buff, 3);

	if (err < 0)

		goto err;

	kctl->private_value = new_val;



err:

	up_read(&chip->shutdown_rwsem);

	return err < 0 ? err : 1;

}



static int snd_mbox1_switch_info(struct snd_kcontrol *kcontrol,

				 struct snd_ctl_elem_info *uinfo)

{

	static const char *const texts[2] = {

		"Internal",

		"S/PDIF"

	};



	return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);

}



static struct snd_kcontrol_new snd_mbox1_switch = {

	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,

	.name = "Clock Source",

	.index = 0,

	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,

	.info = snd_mbox1_switch_info,

	.get = snd_mbox1_switch_get,

	.put = snd_mbox1_switch_put,

	.private_value = 0

};



static int snd_mbox1_create_sync_switch(struct usb_mixer_interface *mixer)

{

	return snd_ctl_add(mixer->chip->card,

			snd_ctl_new1(&snd_mbox1_switch, mixer));

}



/* Native Instruments device quirks */



#define _MAKE_NI_CONTROL(bRequest,wIndex) ((bRequest) << 16 | (wIndex))
@@ -1632,6 +1757,10 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer) 
		err = snd_microii_controls_create(mixer);

		break;



	case USB_ID(0x0dba, 0x1000): /* Digidesign Mbox 1 */

		err = snd_mbox1_create_sync_switch(mixer);

		break;



	case USB_ID(0x17cc, 0x1011): /* Traktor Audio 6 */

		err = snd_nativeinstruments_create_mixer(mixer,

				snd_nativeinstruments_ta6_mixers,

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